Friedricii von hefner-alteneck



(No Model.)

I'. VON H'FJIIER-ALIENECK & lC. HOFFMAN.

ARG LIGHT.

No. 412.141. Patent'edot. 1, 1889.

N. man. mammmgnpmr. wnhmmm n. c,

UNITED STATES PATENT OFFICE.

FRIEDRICH VON HEFNER-ALTENECK, OF BERLIN, AND CARL HOFFMANN, OF CIIARLOTTENBURG, PRUSSIA, GERMANY.

ARC LIGHT.

SPECIFICATION forming part of Letters Patent No. 412,141,dated October 1, 1889.

Application filed April 5, 1889. Serial No. 306,051. (No model.) Patented in Germany June 25, 1887, No. 42,900; in Belgium November 16, 1887, No. 79,560; in France November 16, 1887, Nox 187,029; in Italy December 31,1887,N0.22,804;inN0r Way January 7, 1888, No. 854, and in Austria-Hungary September 25, 1888, No. 17,015 and No. l30063.

T0 @ZZ wbon'l/ it may concern:

Beit known that we, FRIEDRICH voN HEF- NER-ALTENECK, a subject of the King of Bavaria, and a resident of Berlin, in the Kingdom of lPrussia and German Empire, and CARL HOFFMANN, a subject of the King of Prussia and German Emperor, and a resident of Charlottenburg, in the Kingdom of Prussia and German Empire, have invented certain new and useful Improvements in Electric- Arc Lamps; and we do hereby declare the following to be a full, clear, and exact description ot' the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Figure 1 is a vertical projection of our improved lamp. "Fig 2 is a plan view.

The object of this invention (which has been patented in Germany by Letters Patent No. 42,900, dated June 25, 1887; in Belgium No. 79,560, dated the 16th day of November, 1887; in France Ilo.187,029, dated November 16, 1887 5 in Italy, No. 22,801, dated December 31, 1887; in Norway No. 851, dated January 7, 1888, and in Austria-Hungary No. 17,015, tonie 38, folio 2,356,dated September 25, 1888, and' No. 40,068, tome 22, folio 2,828, dated September 25, 1888) relates to improvements in electric-arc lamps 5 and it consists, mainly, in ashunt-circuitlanip in which the upper-carbon carrier C is suspended by a metal ribbon m or metal cord, which is coiled upon a drum d, turning on a shaft around the axle y, the said band m conducting the current into the carrier C. r1`his drum, like the barrel of a clock, is provided with a spring t, which winds up the metal ribbon as soon as the upper-carbon carrier C is lifted. This carbon-carrier, however, is so heavy that it' left free it will turn the drum toward the spring. Into the drum gears a wheel-work, the last shaft of which carries a iiy-wheel and a pendulum, the latter having an escapement. W'hen the frame `Tris up--L 6Withdrawn by the spring f from the magnet e-the pendulum, hanging vertical, forces the escapement into the teeth of the wheel, and thus prevents its rotation, and consequently that of the drum, which 'is geared thereto, and prevents a descent of the carbon-carrier.

The drum, with the wheel-work, is arranged in a frame fr i', which near the center of the drum is pivoted at u: to standards s, carried by the plate or table a of the lamp. An electro-magnet e e, carried by the said plate a, on attractingits armature 7i, secured to the said frame, will turn this frame, which, by an adjustable spring f, is drawn away from the electro-magnet. The said frame fr fr on being turned by the attraction of the armature wi'll first cause the drum to turn so that the upper-carbon carrier is lowered, whereupon the frame, still continuing to turn, the pendulum n falls by gravity and hangs vertical, and is thus removed sutliciently far from the periphery of the wheelto permit the escapement on the pendulum to act, by which the wheel is permitted to turn toothby tooth, and thus the drum slowly revolves, unwinding the nIetallic ribbon and lowering the upper carbon, till it enters into contact with the lower carbon. At this moment, however, the electromagnet in shunt-circuit to the arc of light becomes currentless, as a short circuit for the electro-magnet has been closed through the cai-bons. 'lhe power exercised by the antagonistic spring f', which tends to draw the frame back and to stop the motion of the wheelwork, as also by the retrocessive Inotion of the frame to turn the drum equally backward, will exceed the attraction force exercised by the`1nagnet on its armature till the upper-carbon carrier has been lifted so far and the arc of light has become so extensive that by the electrical tension hereby increased near the arc of light the attraction ot' the electro-niagnet on the armature 7L is in equilibrium with the tension of the antagonistic spring f. If in the progress of burning, the are of light is growing, and with it the tension near it, the frame r r will more and more become attracted bythe electro-magnet and the uppercarbon carrier lowered till, finally, the stopmot-ion of the wheel-work is withdrawn and the upper-carbon carrier led downward proportionately to the carbone being consumed`l 'The clock-sprin g t in the meantime will speedily run off as the coupling R R2 is being disengaged.

It must be stated here that the nose of the clock-spring is secured to the pin S, which is screwed to the inside of the frame r. The end of the spring is secured to the inside of the drum d. It is apparent now, and maybe seen from the drawings, that the spring, being wound up, during the descent 0f the upper-carbon carrier, will act in the opposite direction as soon as the weight of said upper carrier is released. Now the wheel R rests on the piece u, mounted on its shaft y, the pinion of which piece u being in gear with the barrel-wheel R. The force of the unwindingspring therefore presses the Wheel R uponthe coupling R R2. Hence the escapement during the rotation of the drum needs not to be moved, and of the copper band m such length is wound upon the drum as corre' free, its weight presses, by the coupling R R', l

the wheel R into the pinion R2, and now ensues the checking action of the escapement.

To counterbalance the weight of the upper carbon a special device has been applied. The same consists in a small spiral spring f2, which, in the same proportion as the upper carbon gets shorter, becomes more and more stretched, and thereby draws down the frame r r to the same amount to which the weight of the upper carbon is diminishing.

Having now described our invention and also the manner how and the means with which it is to be performed, what we claim, and desire to get secured by Letters Patent of the United States, is-

1. In an electric-arc lamp, the combination, with a carbon-carrier and a drum, ofA a flexible conductor of electricity carrying the carbon-carrier and wound upon the drum, from which it is unwound by the weight ofthe carbon-carrier,a reacting device connected rying the said drum, and a pendulous escapement also carried by the frame and regulated in its operation by the inclination thereof, as and for the purposes described.

2. In an electric-arc lamp, the combination, with a movable carbon-carrier and a drum, of a flexible electrical conductor carrying the said carbon-carrier andwound upon the drum,from which it is unwound by the weight of the said carrier, and a reacting device connected with the said drum which Winds the flexible conductor thereon when relieved of the Weight of the carrier, as and for the purposes described.

3. In an electric-arc lamp, the combination of a pivoted frame, a carbon carried thereby,

a spring drawing the frame in a direction opposite to that in which it is drawn by the weight of the carbon, and an auxiliary spring which, in the consumption and consequent loss of weight of the carbon, stretches and has its strength increased in proportion to the loss of weight of the carbon, as and for the purposes described.

4. In an electric-arc lamp, the combination, with a movable carbon-carrier, of an electromagnet in shunt-circuit to thelamp, a pivoted frame forming an armature for the said magnet, a, druml provided with an escapement mounted in the said frame, and a flexible electrical conductor wound upon the said drum and carrying the carbon-carrier, as and i FRIEDRICH VON HEFNER-ALTENECK. CARL HOFFMANN.

Vitnesses:

MARC M. ROTTEN, B. ROI. 

